﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入要计算的形状：1.圆形  2.正方形");
            string str = Console.ReadLine();
            if (str == "圆形")
            {
                Circle C = new Circle();
                C.GetArea();
            }
            else if (str == "正方形")
            {
                Square S = new Square();
                S.GetArea();
            }
        }
    }
}
